Case structure icon for a display screen of a programmed computer system



FIG. 1 is a perspective view of a case structure icon for a display screen of a programmed computer system showing my new design;

FIG. 2 is a front elevational view thereof; and,

FIG. 3 is an enlarged front elevational view thereof, with the broken-line disclosure omitted.

The broken-line disclosure of a computer and screen in FIGS. 1 and 2 is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a case structure icon for a display screen of a programmed computer system, as shown and described. 